The variation of velocity of a particle with time moving along a straight line is illustrated in the following figure. The distance travelled by the particle in four seconds is.

Options

A. 60 m
B. 55 m
C. 25 m
D. 30 m

Answer

B

Explanation

Distance = Area under `upsilon - t` graph = `A_(1)+A_(2)+A_(3)+A_(4)`
Displacement = positive area - negative area

`=(1)/(2)xx1xx20+(20xx1)+(1)/(2)(20+10)xx1+(10xx1)`
`=10+20+15+10=55m`